For how long should lead and copper records be maintained?

The correct duration for maintaining lead and copper records is 12 years. This requirement is based on the regulations outlined by the Environmental Protection Agency (EPA) under the Lead and Copper Rule. This rule mandates that water systems must retain records of their lead and copper sampling results for a significant period to support monitoring efforts, ensure compliance, and facilitate future evaluations.

Maintaining records for 12 years allows for a comprehensive history of water quality that can be crucial in identifying trends over time, understanding past conditions, and ensuring that adequate public health measures are in place. This extended record-keeping period also serves to provide data for potential investigations or enforcement actions related to lead and copper contamination, reinforcing the importance of compliance with the rule.

Other durations listed do not meet the regulatory requirement, making them unsuitable for proper record-keeping practices in accordance with federal regulations.